Electric lamp



Sept. 26, 1933. E GREEN 1,928,174

ELECTRIC LAMP Filed NOV. 5, 1952 nvcnlor v@QAMdoizm jlllomcy Patented Sept.` 26, 1933 ELECTRIC LAMP Ernest Green, Bridgeport, Ohio Application November 3, 1932. seria1No.s41,os'z

1 Claim.

My invention relates generally to electric lamps, and particularly to electric lamps of the bulb and socket type, and an important object of my invention is to provide means on a bulb for cooperating with means in a bulb receiving socket,

whereby once the bulb has been operatively connected to the socket, it may not be removed without mutilating and destroying the same, so that theft of the bulb from the socket is positively prevented.

Other objects and advantages of my invention will be apparent from a reading of the following description in connection with the drawing, wherein for purposes of illustration I have shown a preferred embodiment of the invention.

In the drawingz- Figure 1 is a sectional elevational view of an electric lamp comprising a bulb and socket.

Figure 2 is a side elevational view of a portion of the bulb showing application thereto of the locking element.

Figure 3 is a horizontal sectional view taken through Figure 1 approximately on the line 3 3, disclosing the arrangement of the other cooperating locking element in the socket.

Figure 4 is a plan view of the locking element on the bulb.

Figure 5 is a side elevational view of Figure 4 showing how the locking element on the bulb is connected.

Referring in detail to the drawing, wherein like numerals refer to like parts throughout the same, the numeral 5 generally designates a typical form of electric light bulb socket having a cylindrical threaded conductor element 6 in the opening thereof for receiving the conductive portion 7 of a conventional type of electric bulb 8.

The socket has in its end wall, instead of thev ordinary knob contact, an enlarged locking contact member 9 which is formed with curved radiating ears 10, which project outwardly of the surface of the member 9 and have their greatest extension from the member 9 at the outward ends as indicated by the numeral 11. The ears 10 incline from a point adjacent the centerof the member 9 upwardly and outwardly to a point substantially on the circumference of the member 9 where they are cut off angularly. The locking contact member 9 is connected by the usual conductor 12 to one of the leadscontained in the conduit 14 which is connected with the socket in the usual way. The conductive cylinder 6 is similarly connected to the remaining Vconductor in the conduit 14. Y

Replacing the ordinary button contact on the Ving member 13 of the bulb will be moved so as to base of the bulb 8 is the winged form generally designated 13. This may take the place of or be added by soldering or by welding or some other suitable method, to the said button contact, so as to be connected to the bulb wire 14 which 60' leads through the usual insulator 15 to the globular portion of the bulb where it projects and carries in conjunction with the remaining one or remaining ones of the other wires 16, the iilament 17.

The object of having the locking member 13 on the bulb is to make electrical contact with the socket contact member 9 when the bulb is screwed into the socket in such a way that when it is attempted to unscrew the bulb from the socket, the locking member 13 of the bulb will be engaged with the contact member 9 of the socket and lock therewith, so that further turning of the bulb in the withdrawing direction will result inpulling out the wire 14 to which the locking member 13 of the bulb is securely connected, whereby to destroy the further usefulness of the bulb. Of course, the bulb may be withdrawn by forcing the same to enable replacement thereof with another bulb.

The locking member 13 of the bulb comprises a central web 18 mounted on a plate 19 which may be the ordinary button contact of the bulb, and from the web 18 radiates curved ears 20 which are elliptical when viewed in side elevation as seen in 85 Figure 5, and which in plan are scimitarshaped. They are also curved in cross section as indicated in Figure 5, so as to produce a propeller formation. It will be obvious that the curved edges 2l of the ears 20 will engage the companion face of the locking member 9 in the socket and when the bulb is placed into the socket and rotated so as to move the same inwardly therein, and that upon further rotation of the bulb in the engaging direction, that the curved edges 21 will ride over 95 and against the upper edges of the ears 10 on the contact member 9. However, should the bulb when so engaged be rotated in the withdrawing direction, the edges 21 of the ears 20 of the lockto the insulator 15 and the base of the bulb so as 119,

2A l c to sever and mutilate the same and destroy the further usefulness of the bulb.

Though I have shown and described herein a preferred embodiment of the invention, it is to be definitely understood that I do not desire to limit the application of the invention thereto, and any change or changes may be made in material and structure and arrangement of parts, within the spirit ofthe invention and the scope of the subjoined claim.l Y 1 Y Y 'Y What is claimed is:- In an electric lamp structure, a socket having therein a plate contact circumferential portion of flat pla-te contact and oppositely to thefcurved Yratchetvears of the base plate contact.

ERNEST GREEN. 

